296 Agkioultueal Experiment Station, Ithaca, N. Y. 



1, upon young plants which were growing vigorously. Enough of the 

 powder was used so that it could be plainly seen; the plants were wet 

 at the time. Two days later some signs of injury were observed, and 

 this continued to increase to such an extent that some of the treated 

 leaves were killed, and one plant died. Some of the other plants show 

 the effects of the application to this date, November 20. 



The insectieidal value of fostite was tested on a small scale by W. J. 

 McNeil, a student doing advanced work in entomology. He dusted 

 thoroughly some chrysanthemum plants which were infested with plant 

 lice, distributing the powder carefully over the entire plant. In addition 

 to this, some of the lice were removed from the plant, and rolled about 

 in the powder. They were then j^laced upon a plant which contained 

 none of the pest. The day following these operations the lice were 

 examined collectively and individually, and no trace of injury was 

 shown by any of them. 



Fostite possesses some fungicidal value. This was most clearly 

 shown by Rea's Mammoth quince, Lucretia dewberry, Ewalt and King 

 apples. 



It must be applied with caution as the leaves of apples, blackberries, 

 dewberries, forcing cucumbers, and forcing musk-melons have been 

 injured by its use. 



When dry, it possesses no value as an insecticide which kills by 

 contact. 



iVb. 8. — Boron compounds. — 



These formulas were used in making solutions, which were 

 applied to the same plants mentioned under No. 7. In no case 

 could any decided benefit which was due to the application be found 

 nor were the plants particularly injured. 



Neither borax nor boracic acid appear to possess any fungicidal 

 value. 



No. 9. — Iodine. — The use of this material for fungicidal purposes 

 was suggested by a correspondent. Some of it was also sent us. A 



